Asubstance made up of only one atom is a(n)
compound
homogeneous mixture
element
solution

Heyyyooo!

The correct answer is element

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Explanation:

Element is a pure substance that is made up of only one type of atom. An element cannot be broken down by any chemical means. However, nuclear reactions can lead to the generation of new elements. Examples of elements include: copper, neon and iron.

answer

procedural programming, object-oriented programming

explanation

procedural programming is a type of computer programming language that specifies a series of well structured steps and procedures   within its development period of time. it contains a systematic order of statements, functions and commands to complete a computational task or program. it is centered on creating procedures. while object oriented programming is a programming language that is centered on creating objects rather that actions and data rather than logic.. it has four principles which are inheritance, polymorphism, abstraction and encapsulation

conservation of mass

mass before something happens = mass afterwards